libgender/oct.C

#include <cstdlib>

#include <vector>
using namespace std;

#include "opengl.h"

#include "oct.h"
#include "view.h"
#include "entity.h"

struct evis {
  enum { FULL, SMALL, OCCLUDED } state;
  double last; // time of last check
  evis () : last(0.), state(FULL) { };
};

struct oct_visibility : visibility_base
{
  typedef map<entity *, evis> evismap;
  evismap vismap;

  enum { FULL, PARTIAL, OCCLUDED } state;

  oct_visibility (octant &oct)
  : state(FULL)
  {
  }
};

octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT);

octant::octant (octant *parent, const sector &orig, uoffs extent)
: parent(parent)
, orig(orig)
, extent(extent)
{
  for (fill = 8; fill--; )
    sub[fill] = 0;
}

visibility_base *octant::new_visibility ()
{
  return new oct_visibility (*this);
}

void octant::clear_visibility (visibility_base *vs)
{
  ((oct_visibility *)vs)->vismap.clear ();
}
octant::~octant ()
{
  for (fill = 8; fill--; )
    delete sub[fill];
}

static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b)
{
  ea /= 2;

  sector center_1 = o1 + ea;
  sector size_2   = b - a;
  sector center_2 = a + (size_2 >> 1);

  return abs (center_1 - center_2) <= ea + size_2;
}

void octant::add (entity *e)
{
  const sector &a = e->a;
  const sector &b = e->b;

  if (overlap (orig, extent, a, b))
    {
      uoffs extent2 = extent >> 1;
      uoffs size = max (abs (b - a));

      if (size >= extent2 >> 1)
        {
          push_back (e);
          e->o.push_back (this);
          return;
        }

      for (int i = 8; i--; )
        {
          sector s = orig;
          s.offset (i, extent2);

          if (overlap (s, extent2, a, b))
            {
              if (!sub[i])
                {
                  sub[i] = new octant (this, s, extent2);
                  fill++;
                }

              sub[i]->add (e);
            }
        }
    }
}

void octant::remove (entity *e)
{
}

bool octant::depth_pass (view &ctx)
{
  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  GLfloat extent2 = 0.5F * (GLfloat)extent;
  sector centeri = orig + (extent >> 1) - ctx.orig;
  point centerf = point (centeri) + ((extent & 1) ? 0.5F : 0.F);

  GLfloat rad = ctx.diagfact * extent2;

  if (orig <= ctx.orig && ctx.orig <= orig + extent)
    ;//vs.visibility = visibility_state::PARTIAL;
  else
    {
      if (ctx.frustum.t.distance (centerf) < -rad) return false;
      if (ctx.frustum.b.distance (centerf) < -rad) return false;
      if (ctx.frustum.l.distance (centerf) < -rad) return false;
      if (ctx.frustum.r.distance (centerf) < -rad) return false;
      if (ctx.frustum.n.distance (centerf) < -rad) return false;

      GLfloat fd = ctx.frustum.f.distance (centerf);

      if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F)
        return false;
    }

#if 0
  if (vs.visibility == visibility_state::OCCLUDED
      || vs.visibility == visibility_state::UNKNOWN)
    {
      ctx.farlist.push_back (this);
      return;
    }
#endif

#if 0
  if (vs.visibility == visibility_state::UNKNOWN)
    vs.visibility = visibility_state::FULL;
#endif

  GLfloat z = ctx.z_near + ctx.frustum.n.distance (centerf) + rad;
  //printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z);

#if 0
  if (vs.visibility == visibility_state::FULL)
#endif
    ctx.nc_far = max (ctx.nc_far, z);

  // node to start with
  unsigned char si = centeri.x > 0 ? 1 : 0
                   | centeri.y > 0 ? 2 : 0
                   | centeri.z > 0 ? 4 : 0;

  //printf ("si %d C %Ld,%Ld,%Ld\n", si, centeri.x, centeri.y, centeri.z);

  // bit-toggle to find next child for front-to-back order
  static unsigned char toggle[8+1]
    = { 0,  0^1, 1^2, 2^4, 4^3, 3^5, 5^6,  6^7, 0 };

  unsigned char *next = toggle;
  do
    {
      si ^= *next;

      if (sub[si])
        sub[si]->depth_pass (ctx);
    }
  while (*++next);

  if (size ()
#if 0
      && (vs.visibility == visibility_state::PARTIAL
          || vs.visibility == visibility_state::FULL)
#endif
      )
    {
      ctx.nz_far = max (ctx.nz_far, z);
      display (ctx);
      ctx.vislist.push_back (this);
    }

  return true;
}

void octant::display (view &ctx)
{
#if 0
  sector s = orig - ctx.orig;

  glBegin (GL_LINES);
  vec3 clr(0, 0.8, 0);
  glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr);

  for (int i = 8; i--; )
    for (int ji = 3; ji--; )
      {
        int j = i | (1 << ji);
        if (i < j)
          {
            glVertex3i (s.x + !!(i & 1) * extent,
                        s.y + !!(i & 2) * extent,
                        s.z + !!(i & 4) * extent);
            glVertex3i (s.x + !!(j & 1) * extent,
                        s.y + !!(j & 2) * extent,
                        s.z + !!(j & 4) * extent);
          }
      }
  
  glEnd ();
#endif
  oct_visibility &vs = *(oct_visibility *)get_visibility (ctx);

  for (iterator i = end (); i != begin (); )
    {
      entity *e = *--i;
      evis &evs = vs.vismap[e];

      sector center = ((e->a + e->b) >> 1) - ctx.orig;
      GLfloat z = norm (vec3 (center));
      ctx.pixfact = ctx.perspfact / z;

      if (ctx.mode == view::POSTDEPTH)
        {
          if (!vb_bbox)
            {
              sector s = orig - ctx.orig;
              gl::gen_bbox (vb_bbox, s, s + extent);
            }

          //vb_bbox.draw (gl::bbox_mode, 0, gl::bbox_count);
        }
      else
        e->display (ctx);
    }
}

#if 0
void octant::draw_bbox (view &ctx)
{
  sector s = orig - ctx.orig;

  gl::draw_bbox (ctx, s, s + extent);
}
#endif

void octant::event (occ_query &ev)
{
#if 0
  visibility_state &vs = ev.v.vismap[this];

  vs.last = timer.now;
  vs.visibility = ev.r <= 0
                  ? visibility_state::OCCLUDED
                  : visibility_state::FULL;
#endif
}


Revision:	1.55
Committed:	Sat Oct 16 23:28:22 2004 UTC (19 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.54:	+3 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include <cstdlib>
2
3	root	1.8	#include <vector>
4			using namespace std;
5
6	root	1.48	#include "opengl.h"
7	root	1.8
8	root	1.1	#include "oct.h"
9	root	1.8	#include "view.h"
10	root	1.2	#include "entity.h"
11
12	root	1.54	struct evis {
13			enum { FULL, SMALL, OCCLUDED } state;
14			double last; // time of last check
15			evis () : last(0.), state(FULL) { };
16			};
17
18	root	1.52	struct oct_visibility : visibility_base
19			{
20	root	1.54	typedef map<entity *, evis> evismap;
21			evismap vismap;
22	root	1.52
23	root	1.54	enum { FULL, PARTIAL, OCCLUDED } state;
24	root	1.52
25			oct_visibility (octant &oct)
26	root	1.54	: state(FULL)
27	root	1.52	{
28			}
29			};
30
31	root	1.8	octant world(0, sector (SOFFS_MIN, SOFFS_MIN, SOFFS_MIN), MAXEXTENT);
32
33			octant::octant (octant *parent, const sector &orig, uoffs extent)
34	root	1.54	: parent(parent)
35			, orig(orig)
36			, extent(extent)
37	root	1.8	{
38			for (fill = 8; fill--; )
39			sub[fill] = 0;
40	root	1.2	}
41
42	root	1.53	visibility_base *octant::new_visibility ()
43			{
44			return new oct_visibility (*this);
45			}
46
47			void octant::clear_visibility (visibility_base *vs)
48			{
49			((oct_visibility *)vs)->vismap.clear ();
50			}
51	root	1.2	octant::~octant ()
52			{
53			for (fill = 8; fill--; )
54			delete sub[fill];
55			}
56
57	root	1.32	static bool overlap (const sector &o1, uoffs ea, const sector &a, const sector &b)
58	root	1.4	{
59			ea /= 2;
60
61	root	1.34	sector center_1 = o1 + ea;
62			sector size_2 = b - a;
63	root	1.54	sector center_2 = a + (size_2 >> 1);
64	root	1.33
65	root	1.34	return abs (center_1 - center_2) <= ea + size_2;
66	root	1.4	}
67
68	root	1.32	void octant::add (entity *e)
69	root	1.2	{
70	root	1.32	const sector &a = e->a;
71			const sector &b = e->b;
72	root	1.7
73	root	1.32	if (overlap (orig, extent, a, b))
74	root	1.4	{
75	root	1.54	uoffs extent2 = extent >> 1;
76	root	1.34	uoffs size = max (abs (b - a));
77	root	1.32
78	root	1.54	if (size >= extent2 >> 1)
79	root	1.8	{
80			push_back (e);
81			e->o.push_back (this);
82			return;
83			}
84	root	1.5
85	root	1.8	for (int i = 8; i--; )
86	root	1.5	{
87	root	1.8	sector s = orig;
88			s.offset (i, extent2);
89	root	1.32
90			if (overlap (s, extent2, a, b))
91	root	1.5	{
92	root	1.8	if (!sub[i])
93	root	1.50	{
94			sub[i] = new octant (this, s, extent2);
95			fill++;
96			}
97	root	1.8
98			sub[i]->add (e);
99	root	1.5	}
100	root	1.8	}
101	root	1.4	}
102	root	1.2	}
103	root	1.1
104	root	1.32	void octant::remove (entity *e)
105	root	1.1	{
106			}
107
108	root	1.55	bool octant::depth_pass (view &ctx)
109	root	1.1	{
110	root	1.52	oct_visibility &vs = (oct_visibility )get_visibility (ctx);
111	root	1.50
112	root	1.43	GLfloat extent2 = 0.5F * (GLfloat)extent;
113	root	1.51	sector centeri = orig + (extent >> 1) - ctx.orig;
114			point centerf = point (centeri) + ((extent & 1) ? 0.5F : 0.F);
115
116	root	1.43	GLfloat rad = ctx.diagfact * extent2;
117
118	root	1.34	if (orig <= ctx.orig && ctx.orig <= orig + extent)
119	root	1.52	;//vs.visibility = visibility_state::PARTIAL;
120	root	1.10	else
121			{
122	root	1.52	if (ctx.frustum.t.distance (centerf) < -rad) return false;
123			if (ctx.frustum.b.distance (centerf) < -rad) return false;
124			if (ctx.frustum.l.distance (centerf) < -rad) return false;
125			if (ctx.frustum.r.distance (centerf) < -rad) return false;
126			if (ctx.frustum.n.distance (centerf) < -rad) return false;
127	root	1.25
128	root	1.51	GLfloat fd = ctx.frustum.f.distance (centerf);
129	root	1.25
130	root	1.47	if (fd < -(ctx.c_far - ctx.z_far) -rad * 3.F)
131	root	1.52	return false;
132	root	1.10	}
133	root	1.8
134	root	1.52	#if 0
135	root	1.46	if (vs.visibility == visibility_state::OCCLUDED
136			\|\| vs.visibility == visibility_state::UNKNOWN)
137	root	1.45	{
138			ctx.farlist.push_back (this);
139			return;
140			}
141	root	1.52	#endif
142	root	1.45
143	root	1.46	#if 0
144	root	1.36	if (vs.visibility == visibility_state::UNKNOWN)
145			vs.visibility = visibility_state::FULL;
146	root	1.46	#endif
147	root	1.36
148	root	1.51	GLfloat z = ctx.z_near + ctx.frustum.n.distance (centerf) + rad;
149	root	1.50	//printf ("z %f, perspfact %f, z*p %f\n", z, ctx.perspfact, ctx.perspfact / z);
150	root	1.45
151	root	1.52	#if 0
152	root	1.45	if (vs.visibility == visibility_state::FULL)
153	root	1.52	#endif
154	root	1.45	ctx.nc_far = max (ctx.nc_far, z);
155
156	root	1.51	// node to start with
157			unsigned char si = centeri.x > 0 ? 1 : 0
158			\| centeri.y > 0 ? 2 : 0
159			\| centeri.z > 0 ? 4 : 0;
160	root	1.44
161	root	1.51	//printf ("si %d C %Ld,%Ld,%Ld\n", si, centeri.x, centeri.y, centeri.z);
162	root	1.19
163			// bit-toggle to find next child for front-to-back order
164	root	1.50	static unsigned char toggle[8+1]
165	root	1.51	= { 0, 0^1, 1^2, 2^4, 4^3, 3^5, 5^6, 6^7, 0 };
166	root	1.19
167	root	1.50	unsigned char *next = toggle;
168			do
169	root	1.19	{
170	root	1.51	si ^= *next;
171	root	1.19
172			if (sub[si])
173	root	1.55	sub[si]->depth_pass (ctx);
174	root	1.19	}
175	root	1.51	while (*++next);
176
177			if (size ()
178	root	1.52	#if 0
179	root	1.51	&& (vs.visibility == visibility_state::PARTIAL
180	root	1.52	\|\| vs.visibility == visibility_state::FULL)
181			#endif
182			)
183	root	1.51	{
184			ctx.nz_far = max (ctx.nz_far, z);
185	root	1.55	display (ctx);
186	root	1.51	ctx.vislist.push_back (this);
187			}
188	root	1.52
189			return true;
190	root	1.19	}
191
192			void octant::display (view &ctx)
193			{
194	root	1.17	#if 0
195	root	1.50	sector s = orig - ctx.orig;
196
197	root	1.8	glBegin (GL_LINES);
198	root	1.13	vec3 clr(0, 0.8, 0);
199			glMaterialfv (GL_FRONT_AND_BACK, GL_DIFFUSE, (const GLfloat*)&clr);
200	root	1.8
201			for (int i = 8; i--; )
202			for (int ji = 3; ji--; )
203			{
204			int j = i \| (1 << ji);
205	root	1.50	if (i < j)
206	root	1.8	{
207			glVertex3i (s.x + !!(i & 1) * extent,
208			s.y + !!(i & 2) * extent,
209			s.z + !!(i & 4) * extent);
210			glVertex3i (s.x + !!(j & 1) * extent,
211			s.y + !!(j & 2) * extent,
212			s.z + !!(j & 4) * extent);
213			}
214			}
215
216			glEnd ();
217			#endif
218	root	1.54	oct_visibility &vs = (oct_visibility )get_visibility (ctx);
219	root	1.8
220	root	1.19	for (iterator i = end (); i != begin (); )
221	root	1.50	{
222			entity e = --i;
223	root	1.54	evis &evs = vs.vismap[e];
224	root	1.50
225	root	1.54	sector center = ((e->a + e->b) >> 1) - ctx.orig;
226			GLfloat z = norm (vec3 (center));
227	root	1.50	ctx.pixfact = ctx.perspfact / z;
228
229	root	1.54	if (ctx.mode == view::POSTDEPTH)
230			{
231			if (!vb_bbox)
232			{
233			sector s = orig - ctx.orig;
234			gl::gen_bbox (vb_bbox, s, s + extent);
235			}
236
237			//vb_bbox.draw (gl::bbox_mode, 0, gl::bbox_count);
238			}
239			else
240	root	1.53	e->display (ctx);
241	root	1.50	}
242	root	1.1	}
243	root	1.8
244	root	1.53	#if 0
245	root	1.38	void octant::draw_bbox (view &ctx)
246	root	1.25	{
247			sector s = orig - ctx.orig;
248	root	1.27
249	root	1.50	gl::draw_bbox (ctx, s, s + extent);
250	root	1.25	}
251	root	1.53	#endif
252	root	1.8
253	root	1.38	void octant::event (occ_query &ev)
254			{
255	root	1.52	#if 0
256	root	1.44	visibility_state &vs = ev.v.vismap[this];
257
258			vs.last = timer.now;
259	root	1.47	vs.visibility = ev.r <= 0
260	root	1.44	? visibility_state::OCCLUDED
261			: visibility_state::FULL;
262	root	1.52	#endif
263			}
264
265	root	1.2